Python 常用代码片段
view plaincopy[*]1.生成随机数
[*] import random #这个是注释，引入模块
[*] rnd = random.randint(1,500)#生成1-500之间的随机数
[*]
[*]2.读文件
[*]
[*] f = open("c:\\1.txt","r")
[*] lines = f.readlines()#读取全部内容
[*] for line in lines
[*] print line
[*]3.写文件
[*] f = open("c:\\1.txt","r+")#可读可写模式
[*] f.write("123")#写入字符串
[*]
[*]4.正则表达式，读取tomcat的日志并打印日期
[*]
[*] import re
[*] regx = "\d\d\d\d-\d\d-\d+"
[*] f = open("c:\stdout.log","r")
[*] i = 0
[*] for str in f.readlines():
[*] if re.search(regx,str):
[*] Response.write(str+"
")
[*] if i>10:break#由于是测试，只分析十行
[*] i=i+1
[*] f.close();
[*]
[*]5.连接数据库
[*]
[*]import pgdb
[*]
[*]conn = pgdb.connect
[*]
[*](host='localhost',databse='qingfeng',user='qingfeng',password='123')
[*]
[*] cur = conn.cursor()
[*]
[*] cur.execute("select * from dream")
[*]
[*] print cur.rowcount
[*]
[*]6.SAX处理xml:
[*]
[*] import string
[*] from xml.sax import saxlib, saxexts
[*]
[*] class QuotationHandler(saxlib.HandlerBase):
[*] """Crude sax extractor for quotations.dtd document"""
[*]
[*] def __init__(self):
[*] self.in_quote = 0
[*] self.thisquote = ''
[*]
[*] def startDocument(self):
[*] print '--- Begin Document ---'
[*]
[*] def startElement(self, name, attrs):
[*] if name == 'quotation':
[*] print 'QUOTATION:'
[*] self.in_quote = 1
[*] else:
[*] self.thisquote = self.thisquote + '{'
[*]
[*] def endElement(self, name):
[*] if name == 'quotation':
[*] print string.join(string.split(self.thisquote[:230]))+'...',
[*] print '('+str(len(self.thisquote))+' bytes)\n'
[*] self.thisquote = ''
[*] self.in_quote = 0
[*] else:
[*] self.thisquote = self.thisquote + '}'
[*]
[*] def characters(self, ch, start, length):
[*] if self.in_quote:
[*] self.thisquote = self.thisquote + ch
[*]
[*] if __name__ == '__main__':
[*] parser= saxexts.XMLParserFactory.make_parser()
[*] handler = QuotationHandler()
[*] parser.setDocumentHandler(handler)
[*] parser.parseFile(open("sample.xml"))
[*] parser.close()
[*]
[*]
[*]7.python的GUI模块标准的是Tkinter,也有QT和MFC的模块，有兴趣的大家自己搜索下
[*]
[*] import Tkinter
[*]
[*] root=Tkinter.Tk()
[*]
[*] my=Label(root,"Welcome to python's world")
[*]
[*] my.pack()
[*]
[*] root.mainloop()
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